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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2400bbf6aa5d50d227c804654f3656be34f1ac2e5aa6ab13f0b838c4d6ed5918' 
  AND token = '36aHMEj7PP8xIU2MZx5HD54KGQKTcZhY5PTJDdV3I/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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