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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ea1a43ee0ae0c6031bc4e7186271cae6a0c6d431baa9204a6dfced362f7ee3' 
  AND token = 'D0ar2kZYKOhlyro+vDunPEG3y7updaOY6i9VOgYNojk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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