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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407b855dd9fa9590d76364b0caeeed79461aab6ba1f4d8cae9e9e92145999e1c' 
  AND token = 'k8X8PHe2WAwAyAe46G04elO4LR4vxf2nOJWgRPplKEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}