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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda16332fe310b4a672dff30d297475e03e846a2cc2dcd3d506b84c53f68aec' 
  AND token = 'f6YPNuOdKJDSAXMJaZrbqXW2IKHnB3NUjEfwD5e9sYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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