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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee924471be2ddc1c772b058c361f466282d873dc153aa2ebcc891b9d0557eeb' 
  AND token = 'FpjNWix+xvSaxUga8VitVkshnIwvM7UTQs8LI4yPCc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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