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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1993bf004ceaebe7ae93e907865fa8ded4fc008b7b6e7ea7a852e6fc7fdddf' 
  AND token = 'eejD2xsoi1F4gJ8/IH0g3bc+9D4YKrOrAH8HSTDZvCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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