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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7d1fe08db7d2faef703c5366adde47e9363e3a67b434bdf8b00fb2e8d38d1f' 
  AND token = 'Ox2nrEXKBtATqlrrObHjruX7EjL9rWnAVrKzQ8UYBBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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