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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fe4fdd05ea245bb63546bebd73c82d81509229bca44f9618d62fd458ea07c8' 
  AND token = 'eJ6L8K4Ps/DtDUDV7Y8BjxT6FNk7ixc98h+Kwrc+c7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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