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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7cc19ebbae6c2e2f3c44ad5656b97a869cbec49e6f7a4d4e45786da92ba743' 
  AND token = 'OsPS2C9rvUqDFxQvfI8qNhg9QuSkRwYj8phI0GC7UnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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