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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bab06c6bec734f73e20f68df7e3c5f8621cc73c2c58d9352bde1292c3618a89' 
  AND token = 'MKWcrgX+kb2KqdyrPnbbtP6dFlp9dmoJfApKQ9w9/T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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