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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ea3012fff9f5e3b4cf1a9b7ebc4663b0c5d2246cfb5d926f2f21547fcd14ef' 
  AND token = 'ZFn9ZDVzi3YCpK5s4090MchXxNtRtvC83cK76yD576o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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