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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b422eea66ba8831a55d07371d33aac12ff3d7ea1e46def4e40bda96be86106' 
  AND token = 'sMXJ5nelxKUFLtUgkSKf8h3DrXcEBJyVY/7FnLx8x0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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