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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cb86148949588709e0589157458ff8fec096d1a83697b8b0142d872817af3d' 
  AND token = 'PYd5QmGLjZih7dGX2LndT9sEbWjn9jBVyrbb0hvCU60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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