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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc9236e4c56063a3742d5ef7b22492ebd1604fda9b731df3c010279ee24cde3' 
  AND token = '9bM5fONoIIpG4nSKQhFZn61bxeVjf0z7rW5u4VO+H+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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