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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32de44e39fd76a64de31ca4867dadbe5e99c04c2f74167ada94cb446722cb34' 
  AND token = '8MgMaRH3z4j7n0m6VUR3eEpXnMk1UyqxxYz3lnk4KT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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