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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523bd9a855bd8568578dd8880ab7df7f79c57326fc6706187918c3b04f973ea3' 
  AND token = 'FA2r3JM4fhTsYW14rgc4VyzprkwhuIwSB2gSfVVfCPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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