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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f383549526a9b6ea742f16d9800b6c07ba08e8ef36e6756ff90aedb6abe7cfc7' 
  AND token = 'lflXGvtK8zjnWBeh0kwqFlkeHvSKR3b9r4fEhYna2PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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