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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26bde8d93ef112ce08494a4277845432950d981fa3235c11ed08d4f6d345fc8' 
  AND token = '913Q5WWzwXNymLnK1RWbeeQMsdAzA8l0khtHqOwMIbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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