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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09562045d5aabfe7607eedbd868b20de596586ad7b669e1adc675659454fa82' 
  AND token = 'DPszP6XuecqTbheX2MR4i66H7bDyAI0y4dH6hHWI810=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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