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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582c0bd5d647566ee735637b2e5744496f903615a043bc8d4011f27df05c6a53' 
  AND token = '9Kfb/G+4JMhXPseE9djT/M6TKPkETl6GyIsYfeVitNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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