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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba964d6ff3f5bb512bcffe88f9cc519c6859a06b853c85f97cae0d05e8d36cc' 
  AND token = 'N9fK0A6hzVI7kRhmA5pd+1ZupNmlhyLKvbEXxqLm9DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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