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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23e21f4cc56514fa4bbfc50c670417ddab4d068f7cb697aa5a9515ddbf77995' 
  AND token = 'vLchh7AZXl7NMWY2GmnDOnGfquiyAjl7149pwtIGw8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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