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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166da440533e7b14aae7af7fcc0d01485c72ed43c2dbb4f85877c25abe7db4d4' 
  AND token = 'l6MleP/TB+ekK4095eFQOZPR9/QaeeMQpgli/lQVvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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