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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7884d3a4fb853180e83ab9dce52f9e2d45e1fe73d2c7f05b70f58ad8b40f72d2' 
  AND token = '+fcB44yZHBPoaJ2tu2Ndn9uO5b5FmjHoNkSM71qsvV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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