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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd35c5e71a288e119aeb311c6d93a4a80f0d0991ca94c4a643ded29ecd8025cd' 
  AND token = '4QlCSfdD7woZ/XbBNMkL8lgbZXOeNPVpLR7DI9RAeBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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