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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd9cb09c065e7a8e32b9440497b92725da9c1fcb352ab67cd8b8d7ee4e0da34' 
  AND token = 'ABaBLYfpnqa3kzJusmArrTgy3YUVkl73RrWlNTBt3N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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