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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8aa533ea29d062f766e55435d68c8edbcebc12d0886a5460cbfb7f58ec75a5' 
  AND token = 'W0i/BKyNMg0qkC3FdojbKMhcCP6k5AphMKdWsGCws+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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