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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeae1abf7f49a75780b5eda47cef84bb4d2f88357486591686564199c722c14c' 
  AND token = 'YhIK5kOhnNBHQinQYvFxw8Ba5kB4+bNJRsJEkowaBII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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