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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610851b13b6b9a3369bd20dfd57dc7b238e5bd69d3abb6c25d8ebff34a037f61' 
  AND token = 'aHUHQoI52ZZh0cdYzBILvoUA4LgKHRx5kGcqoPhQ7AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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