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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7335385cc4d55af006f6cad8320f12d379d43fcfd208e7081f8c18c42f502cb2' 
  AND token = 'gkQRhj8rTD5JHIEDXJ4a2nI5s7MXd0+gdjZdPwCzB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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