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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f89f38975eafa28776feb0529cec5df27c4553bd2c9249af95aaa3f41c777e8' 
  AND token = '2uTpnyWGUX7rRSCo3jLktb96EYLi2GXLGqfuEPrQ5GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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