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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469b55f01c90ba015c3b7834fee38cc160433b4b2eb7c2df899e572b471a26ff' 
  AND token = '6HPbz3TDNluyy2cs3RUzn2fKd/0Bu3vJl/Sixyr0mtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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