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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e37c21548bef554704aa5a58f2b30194030d4314ff2ac9f703d6f9b0437602' 
  AND token = 'rFdzNr7vCJkWeXtcQ8uKw40ypOgB5eXXCIx0o234Tog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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