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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7616aa64c7cb599b2b53a1c9f077764eee8ff7e097bb82e788a5e4d93f7f148' 
  AND token = 'Wtc9DrOzZFL+HgWF0zQphH9sRxZokVJDfqXd+3ajN6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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