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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45613631eb7a7c58e8080c4f176dacf26aa06975fe1dc0fe2f818ebf77dd7f0a' 
  AND token = '1n8ehL3lJT8EsGrU2lM+tA1edFEWxZrfWK7OuA5XRuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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