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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701d3c799e37397908f2b6b9af5fe6f2fd58f5b4885184baf759ad871ad5dd01' 
  AND token = 'grpuc4eOyPJ5eCeStcInfdHfivs7VS7NHVdywZV8wZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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