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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f96ce396add8be602ec3df35fd3f575d6471fcd99ea32d4592c07348da29646' 
  AND token = 'psMONlE8zyAyg7oNYRKN3rS6wIhJ3nIg88J9bMu0nec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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