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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7819bae26753941cd7527a113f88444b9a481474ee44b7ab245356c1f153313' 
  AND token = 'awrcZWYF1TRkIGuwuJJT9VlUaNdivJstZ9uP64aASb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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