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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98c0348ee30b76fdfc6ba4e0fc8c7497ca18e44b4214bc8452856d1ceb60299' 
  AND token = '/LFcZ0afjHGxwW0RfcRtd5cP/HG1pIbw2CgQw5XcaKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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