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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79661d45c1db16edbfe1f301d9b5feb5dbb8753c09cd0ee46f9119b03c0d5dc' 
  AND token = 'M49IC7Bgh+r4bRC2CQcWpbmtSiKLcTYdvkFUO9L2G9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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