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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1db35d7844e42d1cc7df635161fc981f1171317d6848fc1a64ac64b94600a02' 
  AND token = 'YX+OB4flUAq87bVn2KbeQ9Zi54pNHDlMyzhM7a0vrhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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