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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdfd7adab5b8a1b21ab08ef2933285997c7414d1f8fc6633a8a67c029e939e3' 
  AND token = 'dYPzUhxcQ112X0JulkuAB521FcsdSzsevrRrVSj7CgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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