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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2fc95bed94ac9fd2eae89dbb27b6f665a738c1db7c9d6173ad8acdc5f0ffc1' 
  AND token = '333nx/4B3Cmjl1seVmWhxn3SgPiUvFN+gr0adodbRxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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