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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa148de284c7c0017fcf76a536a0ffd2e41983635302ebf53f1c04368f363d19' 
  AND token = 'boab1BZ75f/jFJj3XUGZW0kS2f6uhRGYItOot7SG+es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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