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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd47845e50b4cf986727b3d4b0b0615045ec600b5987b34ce0056e51e5c24d7' 
  AND token = 'UDoACdV6hrzNADpCMkYkuH7P24I5Uz4E7DIiuCYZiUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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