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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111af4f0e64f984d25b226dc8d14f8e97d8592db4186cd444d4ec7dd2cb9442' 
  AND token = 'VFRLhAiJnH6eDBMgs4H6gdE5OV4YtJWiyPJ7yvUDxsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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