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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4f45c0407ee7cfe9a49d2edf6caa99f56048ba6197452542eae061312f619c' 
  AND token = 'T39iyWWHeROPUjGBAZ03yngUjX1BLmWWyuQswBK6zDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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