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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31c278581cc9ae9ffc4ac042fb6b2118ad7038b4e54d880762f126e4266b5e0' 
  AND token = 'kuWzVYlVJt8hUr447AvZ4yngEpd+t+9QgA9tXz7tYSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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