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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20e73bccfb8fb8a714e602af2bea6da8c8ba57826e6b7d3be656ea82998d960' 
  AND token = 'y8Y3JMpkWOYl0UgVhMIjNjczpb1I8r61lyCcAIY18eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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