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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a50bf585d31247cdbd38468d4a08e33d7753685525a3170ec186e3a51541d3' 
  AND token = '5OY1fdyR5pbPePA23iBCbhIoR26HxEGCKz+nCeAxLXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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