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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9e493f9c45685d4abb8e55593f774bc6f037958872f9121fc1586c6c8a9ee9' 
  AND token = 'Xu42SGJuHHqmFKTxp3SV1W2VLtLRMJSwGtofNdtdHDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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