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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aabf0dd1e8ea99a1d098285c5e4f48985b6c02a07f6f98f058ae9caf74dbfd' 
  AND token = '/2fXM++Z54bcpL5Blhh3tkUJYVrlx97ewsZ4Ox+EcU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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