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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886c436244ea443eccc5c9ae8aa2192bfccd80455ed6fd23caccfa16c6a7c2ba' 
  AND token = '7xBSZ9qixgYfeE2nEiTKs4L5frzYXSWyBOKzMeMwtYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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