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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3759d15c0c856ce8b5c6a69510b4382cb20297ad55f748d8bf100fa98dd750d' 
  AND token = '9FKti+SwZFdgshK9z9g59vX59LjFwfPap6ytW9wPLmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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