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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fce162700a284a7b7b1f7b8e48b784ed7a15304f0f13c506ec7d422be68a339' 
  AND token = '46fYEABSrqOf2VwdrcM+NOdfdP7Q3CU862HRyxxISEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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