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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b50db508c40a5d3143c6f3f8e1ae66f119c44dcb61a72526564165ca8b9bf45' 
  AND token = '0ifnXQ2BZXIzXawIRncTC6YXBP1hcldtxlg9uJM74bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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