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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4886d4059bb6675e460274adbccdf03a3d816fd5b90e7faacff908adaa542b6' 
  AND token = 'qDl0pMSiuGfFGvsCLEQQHLN7Tf+12/6rz5ADVgkHOn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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