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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fadf8bf97ca23f4c93edc57fb3ab56e58c7a91019c155f8c7fa1475e33edda' 
  AND token = '1PV+Iv1fDbmeJWhAwtz7LKDhvh2lbHFb72QJmZdTfuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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