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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff945871e250eda1896251d5a86ec4f914b38af6f22a45d827d0b51855700943' 
  AND token = '7sIIQn4De5/Dl4hlmVXWV+71gef3IAG5ZjD/6lxeqFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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