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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634c1e2d3a656b8c8b635df73f9fe80ea949a5a111ed6639e2da8901d2d2395e' 
  AND token = '389jvr98iELePGPJEYkTk/eysGQ0JYETbZOwu8DfEM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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