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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79e93e5aebf93327273467b8e30858620a38b3eef8abffb3db6ed990d8aba12' 
  AND token = 'GXq0KLpB2REgHz5Hd+q69Vj1FXM8LboN8WZlHEatkTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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