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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7772d077df2df67e917b44ba958ce02010cb449f7860935f7daf75ca0545b84f' 
  AND token = 'zytkDaO/vEvAI0iqIFyz70SxVuV/xaXWGPMbp16mg0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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