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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29750d98cbc26c6ffbc8da4f1201327999f5f3dd844177cdd40c6b04bd5b05c' 
  AND token = '1WpvFhl3Ji4pOd4u+1qJFEMLO4MN6/ncQLe6BW7/qVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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