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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26c4a1e4ae220879a656b5b9615a898403c581ab7aff84b37b749dc54eefb31' 
  AND token = 'C8JVZNF1OU4B3sIJWHJkYrIOp7PGWPMUtBPRNl56qF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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