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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6770d162e19c0529371311765724dbcd105a14faea463d90cfe26d3b26bb8b' 
  AND token = 'm05bU7H0WO/8P3jAvpt1wMlCnbY5Pbh1YFjvdzlgUko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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