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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0cdc118f00c9257b838227751213dd9ad0e60fab1573ca7650dde1dfb8ce7e' 
  AND token = 'oI/MX6BYbv51DZGjRGgsS+XNz/tfRbWzalOWxdABBGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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